Fig. 3

Comparative genomic and phylogenetic analyses. (A) Venn diagram of homologous gene families among the red form of T. urticae, the green form of T. urticae, Ixodes scapularis and Drosophila melanogaster. (B) Phylogenetic relationships of both forms of T. urticae to other species based on single-copy orthologous genes derived from full genomes. Twelve organisms were used for the analyses, including both forms of T. urticae, Stegodyphus mimosarum, I. scapularis, Tachypleus tridentatus, Sarcoptes scabiei, Dinothrombium tinctorium, Leptotrombidium deliense, Strigamia maritima, D. melanogaster, Daphnia pulex and Caenorhabditis elegans. The maximum-likelihood phylogenetic tree was reconstructed with 1000 ultrafast bootstraps and selected substitution models of the options “-mset” (WAG and LG). The focus (two forms of T. urticae) in our study are marked with red